%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% This file is part of the book
%%
%% Algorithmic Graph Theory
%% http://code.google.com/p/graph-theory-algorithms-book/
%%
%% Copyright (C) 2009--2011 Minh Van Nguyen <nguyenminh2@gmail.com>
%%
%% See the file COPYING for copying conditions.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{external}
\usetikzlibrary{trees}
\tikzexternalize{filesystem-hierarchy}

\begin{document}

\begin{figure}
\begin{tikzpicture}
[-,thick]
\footnotesize
\node {\texttt{/}} [edge from parent fork down]
  child {node {\texttt{bin}}}
  child {node {\texttt{etc}}}
  child {node {\texttt{home}}
    child {node {\texttt{anne}}}
    child {node {\texttt{sam}}}
    child {node {$\dots$}}
  }
  child {node {\texttt{lib}}}
  child {node {\texttt{opt}}}
  child {node {\texttt{proc}}}
  child {node {\texttt{tmp}}}
  child {node {\texttt{usr}}
    child {node {\texttt{bin}}
      child {node {\texttt{acyclic}}}
      child {node {\texttt{diff}}}
      child {node {\texttt{dot}}}
      child {node {\texttt{gc}}}
      child {node {\texttt{neato}}}
      child {node {$\dots$}}
    }
    child {node {\texttt{include}}}
    child {node {\texttt{local}}}
    child {node {\texttt{share}}}
    child {node {\texttt{src}}}
    child {node {$\dots$}}
  }
  child {node {$\dots$}};
\end{tikzpicture}
\end{figure}

\end{document}
